JSON → JSON Schema

Generate a JSON Schema from an example

JSON Schema describes the structure a JSON document must follow, and writing one by hand is laborious. This tool generates a JSON Schema from example JSON, inferring the types and structure so you have a schema to validate against and refine.

Why infer a schema from data

A schema written from scratch has to enumerate every field and type correctly, which is slow and easy to get wrong for nested data. Inferring it from a representative example gets the structure and types right by construction, including nested objects and arrays, giving you a working schema in one step. The generated schema is a starting point, since a single example cannot express which fields are required or what value ranges are allowed, but it removes the bulk of the manual work.

A schema to build on

It runs entirely in your browser, so nothing you paste is uploaded and the result is yours to copy straight into a project. Because it works client-side, you can use it on private code and data without anything leaving your machine.

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